Regional Rankings

Regional Data Info
Please note, Palmer Indices are not available for NWS Regions. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Northwest Climate Region

Precipitation Rankings, May 1977

View Period (Months):
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  • Record Driest
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
May 1977
1-Month
3.46"
(87.88mm)
2.14"
(54.36mm)
1.32"
(33.52mm)
114th Driest
Driest since:
1924
15th Wettest
Wettest since:
1998
Apr–May 1977
2-Month
4.18"
(106.17mm)
4.50"
(114.30mm)
-0.32"
(-8.13mm)
52nd Driest
Driest since:
1924
77th Wettest
Wettest since:
1996
Mar–May 1977
3-Month
7.48"
(189.99mm)
7.76"
(197.10mm)
-0.28"
(-7.11mm)
57th Driest
Driest since:
1924
72nd Wettest
Wettest since:
2011
Feb–May 1977
4-Month
9.34"
(237.24mm)
11.37"
(288.80mm)
-2.03"
(-51.56mm)
25th Driest
Driest since:
1924
104th Wettest
Wettest since:
1904
Jan–May 1977
5-Month
10.76"
(273.30mm)
15.90"
(403.86mm)
-5.14"
(-130.56mm)
5th Driest
Driest since:
1924
124th Wettest
Wettest since:
1904
Dec 1976–May 1977
6-Month
12.07"
(306.58mm)
20.54"
(521.72mm)
-8.47"
(-215.14mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1997
Nov 1976–May 1977
7-Month
13.08"
(332.23mm)
24.89"
(632.21mm)
-11.81"
(-299.98mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1974
Oct 1976–May 1977
8-Month
14.22"
(361.19mm)
27.45"
(697.23mm)
-13.23"
(-336.04mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1974
Sep 1976–May 1977
9-Month
15.42"
(391.67mm)
28.87"
(733.30mm)
-13.45"
(-341.63mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1974
Aug 1976–May 1977
10-Month
17.91"
(454.91mm)
29.68"
(753.87mm)
-11.77"
(-298.96mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1974
Jul 1976–May 1977
11-Month
18.84"
(478.54mm)
30.40"
(772.16mm)
-11.56"
(-293.62mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1974
Jun 1976–May 1977
12-Month
20.08"
(510.03mm)
32.13"
(816.10mm)
-12.05"
(-306.07mm)
1st Driest
Driest since:
1977
127th Wettest
Wettest since:
1996
Dec 1975–May 1977
18-Month
41.09"
(1,043.69mm)
52.65"
(1,337.31mm)
-11.56"
(-293.62mm)
3rd Driest
Driest since:
1930
124th Wettest
Wettest since:
1997
Jun 1975–May 1977
24-Month
55.19"
(1,401.83mm)
64.28"
(1,632.71mm)
-9.09"
(-230.88mm)
9th Driest
Driest since:
1930
118th Wettest
Wettest since:
1997
Jun 1974–May 1977
36-Month
86.37"
(2,193.80mm)
96.36"
(2,447.54mm)
-9.99"
(-253.74mm)
16th Driest
Driest since:
1931
110th Wettest
Wettest since:
1998
Jun 1973–May 1977
48-Month
129.11"
(3,279.39mm)
128.40"
(3,261.36mm)
0.71"
(18.03mm)
67th Driest
Driest since:
1931
58th Wettest
Wettest since:
1999
Jun 1972–May 1977
60-Month
154.90"
(3,934.46mm)
160.37"
(4,073.40mm)
-5.47"
(-138.94mm)
39th Driest
Driest since:
1933
85th Wettest
Wettest since:
1999

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